The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x+4\right)\left(x+6\right)$
$\left(x-3\right)\left(x-4\right)$
$\left(x-6\right)\left(2-x\right)$
$\left(x+7\right)\left(7-x\right)$
$\left(-6+x\right)\left(-x+5\right)$
$\left(-3+x\right)\left(x-9\right)$
$\left(-5+x\right)\left(4+x\right)$
$\left(5-x\right)\left(8-x\right)$
$\left(-x+6\right)\left(x-1\right)$
$\left(-6x+1\right)\left(4x+5\right)$
$\left(2x-5\right)\left(5+2x\right)$
$\left(7x-3\right)\left(3-5x\right)$
$\left(1+6x\right)\left(5x-1\right)$
$\left(1+4x\right)\left(7x+8\right)$
$\left(2-3x\right)\left(2-7x\right)$
$\left(4+5x\right)\left(1-6x\right)$